You're right, to be very specific hollow core doors have something
closer to a thin piece of MDF where masonite is closer to an HDF. But
both are basically the same material, one is compressed a bit more.
At this thickness it doesn't matter much.
Or they can - and often do - have skins of plywood. Generally, about 1/8"
luan. In fact, you can goto HD/Lowes and purchase such skins should youwant
to make your own doors (or for any other purpose).
Some hollow doors use 1/4" hardwood plywood.
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